It was recently announced that the sequel to the 1996 film 'Trainspotting' will bring back Mark Renton (Ewan McGregor), Sick Boy (Jonny Lee Miller), Spud (Ewen Bremner) and the hotheaded Begbie, who was played by Robert Carlyle. Now it appears that the script has already been finished and that the 'Once Upon a Time' star already knows what will happen in 'Trainspotting 2.'

"We've already had a read-through of the script, we did that in the springtime," Carlyle admitted to NME, adding that he loved what he has read.

"You're going to think, 'Of course he's going to say this,' but honestly, it's one of the best scripts I've f--king read. I mean, ever. What [screenwriter] John Hodge has done is just so clever," he said.

When asked to explain his statement, Robert Carlyle continued by offering a few details about 'Trainspotting 2.'

"Well, obviously these four characters are 20 years older now and I've never seen a sequel that takes place 20 years after the original, so I think that gives it a certain unique quality. And of course, the audience is 20 years older too - people who came to see the original film when they were in their early twenties are very different people now," he explained, adding that both John Hodge and director Danny Boyle has a lot in store for the fans.

"The way John Hodge has put this thing down, obviously with the help of Danny Boyle, is to make it about how the characters' lives have moved on... or have they? Without giving anything away, maybe some of them haven't really moved on." Carlyle said. "That's what the audience is going to have to go through with them. I tell you, this film is going to be quite emotional for people because the film sort of tells you to think about yourself. You are going to be thinking: 'F--k. What have I done with my life?'"

'Trainspotting 2' is expected to start shooting in 2016 so it can be released later in the year.